Bolt press with punch carrier pivotally mounted on a reciprocatory press carriage

ABSTRACT

A bolt press with reciprocable press carriage having a punch carrier pivotally mounted thereon, and an ejecting device arranged within the press carriage for the punch means. The ejecting device is drivingly connected to a cam disc mounted on a splined shaft, while additional cam discs and a two-arm lever for driving the punch carrier are arranged outside the press carriage approximately in the plane of the punch carrier.

United States Patent 1191 Nebendorf et a1.

BOLT PRESS WITH PUNCH CARRIER PIVOTALLY MOUNTED ON A RECIPROCATORY PRESS CARRIAGE Inventors: Heinrich Nebendorf; Karl Heinrich Sieben, both of Wuppertal-Ronsdorf, Germany Gebr. Hilgeland, Wuppertal, Germany Filed: July 13, 1972 Appl. No; 271,242

Assignee:

Foreign Application Priority Data July 15, 1971 Germany 2135405 s. c1 10/11 E Int. Cl B2lk 1/44, B21k 31/00 Field of Search 10/11 R, 11 A, 11 T, 12 R,

10/12 T, 12 s, 15, 27 R, 27 PH, 11 E; 72/427 References Cited 2 UNITED STATES PATENTS Friedman .l 10/l2.5

[ Apr. 9, 1974 2,705,333 4/1955 Friedman. 10/11 R 3,353,417 11/1967 Nebendorf et a1 l0/l2.5 3,477,075 11/1969 Putetti 10/12 R 3,688,322 9/1972 Van De Meerendonk 10/12 R 3,264,853 8/1966 Huber 10/11 R Primary Examiner-Charles W. Lanham Assistant Examiner-E. M. Combs Attorney, Agent, or Firm-Walter Becker [57] ABSTRACT A bolt press with reciprocable press carriage having a punch carrier pivotally mounted thereon, and an ejecting device arranged within the press carriage for the punch means. The ejecting device is drivingly connected to a cam disc mounted on a splined shaft, while additional cam discs and a two-arm lever for driving the punch carrier are arranged outside the press carriage approximately in the plane of the punch carrier.

4 Claims, 1 Drawing Figure BOLT PRESS WITH PUNCH CARRIER PIVOTALLY MOUNTED ON A RECIPROCATORY PRESS CARRIAGE The present invention relates to a bolt press with a punch carrier which is pivotally mounted on a reciprocatory press carriage, and in which a two-arm lever is non-rotatably connected to the punch carrier for pivoting about the same axis about which the punch carrier is pivotable. The two-arm lever is provided with two rollers for respective cooperation with two cam discs arranged one behind the other on a profiled splined shaft. A bolt press of this type is disclosed, for instance, in German Pat. No. 1,527,465.

Occasionally the necessity occurs to provide an ejection mechanism for the punches mounted on the punch carrier. With a heretofore known bolt press of the just described type this necessity can be met only with rather complicated and expensive constructions, regardless in which direction the solution to the problem involved is attempted. At any rate, a correspondingly greater length of the press carriage is required which fact not only increases the manufacturing costs for' such press but also reduces'the maximumpressing speed in view of the larger masses of the press.

It is, therefore, an object of the present invention to provide a bolt press of the above mentioned general character which will overcome the drawbacks outlined above.

It is another object of this invention to provide a bolt press as set forth in the preceding paragraph, in which the mass of the press carriage will be kept at a minimum.

These and other objects and advantages of the invention will appear more clearly from the following specification in connection with the accompanying drawing illustrating a section through a portion of a bolt press according to the invention showing in particular the press carriage with ejector mechanism in conformity with the present invention.

The bolt press according to the invention is characterized primarily in that in the press carriage there isprovided an ejector mechanism for the punches which ejector mechanism is operatively connected to a cam discwhich is mounted on a profiled splined shaft, and is furthermore characterized in that the cam disc and a two-arm lever which is non-rotatably connected to a pivotally mounted punch carrier andis intended for operating the punch carrier are located outside the press carriage approximately in the plane of the punch carrier. In this way, in the interior of the press, carriage space is provided for the ejector mechanism without the necessity for'this purpose to extend the length of the press carriage. As a matter of fact, it is'even possible with this construction to reduce the length of the press carriage over that of press carriages of heretofore know presses because the profiled splined shaft accord ing to the present invention is journalled only once in the press carriage, and furthermore instead of the previously employed pivotable shaft in the press carriage there is provided a shaft fixedly connected to the press carriage and intended for the punch carrier. Due to the fact that this last mentioned shaft is fixedly connected to the press carriage, that portion of the shaft which is located within the press carriage can be made shorter than the corresponding portion of the pivotal shaft as it is used in heretofore known presses.

According to a preferred embodiment of the invention, the ejector mechanism is for purposes of actuating the ejector pin provided with a pivotable angle lever which is journalled in the press carriage-and is pivotable about a pivot axis which extends transverse to the plane passing through the axes of the profiled splined shaft and of the ejector pin. Resting against one arm of the angle lever is a spring-urged ejector pin which is journalled in the press carriage, whereas the other arm of the angle lever carries a rollerfor cooperation with the cam disc, this arm extending approximately in the pressing direction. This specific embodiment fits well into the space provided in the press carriage when the cam disc and the two-arm lever for driving the punch carrier are located outside the press carriage as suggested in conformity with the present invention. In connection with some machining operations, relatively high forces will occur in the drive of the ejector mechanism which forces may result in a premature wear, especially of the roller cooperating with the cam disc and also with regard to the journaling of the roller and the cam disc. In order to assure a satisfactory power transfer in 'this connectio'n, in other words, in order to be able to extend the arm of the angle lever carrying the roller without necessitating a corresponding increase in the length of the press carriage including the splined shaft or without the necessity of reducing the length of thedrive wheel which is mounted on the splined shaft and is longitudinally displaceably but non-rotatably arranged thereon (which would result in a reduction in the immersion depth of the splined shaft), it is suggested according to a further advantageous feature of the invention that the cam disc is pot-shaped and that that range of the cam disc which comes into contact with the cam disc surrounds the profiled shaft within the profiled region thereof. In this way favorable lever conditions on the angle lever are created without the necessity of changing the press carriage and 'othe structural elements of the press.

For purposes of assuring a satisfactory power transfer and an operation of the ejector mechanism which will practically be wear-free for a long period of time, it is advantageous according to a still further feature of the invention to rest the ejector pin against a flattened bolt which is rotatable about an axis parallel to the pivot axis of the angle lever, the flattened bolt being provided at the end of one arm of the angle lever.

Referring now to the drawing in detail; the structure shown therein comprises a presscarriage l which is mounted in a machine frame 3 and is adapted tobe reciprocated by means of a connecting rod 2.

Mounted on the end face of the press carriage 1 is a punch carrier 4 which is pivotable in a direction transverse to the upsetting direction of the bolt press. The

. punch carrier 4 is by means of non-ilustrated connecting elements firmly connected to a two-armleverS. The punch carrier 4 firmly connected to the two-arm lever 5 is journalled on a shaft 6 and is secured by a to permit a relative movement of shaft 14 with regard to the drive wheel 17.

In the interior of the press carriage 1 and at that side of the portion 15 of shaft 14 which is located opposite the pivot 13 there is fastened a cam disc 18 which is preferably pot-shaped. The cam disc 18 is engaged by a roller 19 which is journalled on the arm 20 of an angle lever 21. The cam roller 19 is in engagement with a portion of the cam disc 18 which portion surrounds the splined shaft 14 and, more specifically, the profiled portion 16 thereof.

The other arm 22 of the angle lever 21 has its end provided with a bolt 24 having a flattened portion 23. Bolt 24 is arranged in the arm 22 so as to be rotatable about an axis which is parallel to the pivot axis 25 of the angle lever 21. An ejector pin 26 rests against the flattened portion 23 of bolt 24. A pressure spring 28 acts upon the collar 27 of the ejector pin 26 which widens toward one end. Furthermore, an additional pressure spring 29 acts upon the angle lever 21 and, on one hand, engages a bearing portion 30 of the press carriage 1 and, on the other hand, engages an extension 31 of the angle lever 21. In this way, the cam roller 19 will always be kept in contact with the cam disc 18.

The ejector mechanism described above is preferably employed in connection with bolt presses which in addition to the above described double cam disc for controlling the punch carrier also comprises a locking mechanism known per se and designated with the referonce numerals 32, 33 and 34 for the end positions of 30 What we claim is:

1. In combination with a bolt press having a reciprocable press carriage, firstshaft means arranged in said press carriage, punch means, a punch carrier for supporting said punch means, said punch carrier being adapted to pivot around said first shaft means, atwoarm lever supported by and pivotable in a pivot plane about said first shaft means and being non-rotatably connected to said punch carrier, splined shaft means, driving means for selectively rotating said splined shaft means, first and second cam disc means connected to said splined shaft means for rotation therewith, and two roller means mounted on said two-arm lever for respective cooperation with said first and second cam disc means; an ejecting device positioned in said press carriage for ejecting bolt blanks from said punch means, and third cam disc means connected to said splined shaft means for rotation therewith, a third roller means rotatably mounted on saidejecting device and journalled about an axis located in a plane perpendicular to the pivot plane of said two-arm lever, said third cam disc means being in engagement with said third roller and in operative driving connection with said ejecting device, and said first and second cam disc means and said two-arm lever for driving said punch carrier being located outside said press carriage and approximately in the plane of said punch carrier.

2. An arrangement in combination according to claim 1, in which said ejecting device includes a spring loaded ejector pin and also includes a pivotable angle lever pivotally journalled in said press carriage for actuating said ejector pin, the pivot axis of said angle lever extending transverse to the plane defined by the axis of said splined shaft means and the axis of said ejector pin, said third roller means being for cooperative engagcmentwith said third cam disc means, one arm of said angle lever carrying said roller means and the other arm of said angle lever having said spring loaded ejector pin resting thereagainst.

3. An arrangement in combination according to claim 2, in which said third cam disc means is of a potshaped design opening toward said driving means, that portion of said third dam disc means which is in cooperative engagement with said third roller means surrounding a portion of the splined section of said splined shaft means.

4. An arrangement in combination according to claim 2, which includes bolt means rotatably journalled in that arm of said pivotable angle lever which is adjacent to said ejector pin, said bolt means having a flattened side for engagement with said ejector pin and being rotatable about an axis substantially parallel to the pivot axis of said angle lever. 

1. In combination with a bolt press having a reciprocable press carriage, first shaft means arranged in said press carriage, punch means, a punch carrier for supporting said punch means, said punch carrier being adapted to pivot around said first shaft means, a two-arm lever supported by and pivotable in a pivot plane about said first shaft means and being non-rotatably connected to said punch carrier, splined shaft means, driving means for selectively rotating said splined shaft means, first and second cam disc means connected to said splined shaft means for rotation therewith, and two roller means mounted on said twoarm lever for respective cooperation with said first and second cam disc means; an ejecting device positioned in said press carriage for ejecting bolt blanks from said punch means, and third cam disc means connected to said splined shaft means for rotation therewith, a third roller means rotatably mounted on said ejecting device and journalled about an axis located in a plane perpendicular to the pivot plane of said two-arm lever, said third cam disc means being in engagement with said third roller and in operative driving connection with said ejecting device, and said first and second cam disc means and said two-arm lever for driving said punch carrier being located outside said press carriage and approximately in the plane of said punch carrier.
 2. An arrangement in combination according to claim 1, in which said ejecting device includes a spring loaded ejector pin and also includes a pivotable angle lever pivotally journalled in said press carriage for actuating said ejector pin, the pivot axis of said angle lever extending transverse to the plane defined by the axis of said splined shaft means and the axis of said ejector pin, said third roller means being for cooperative engagement with said third cam disc means, one arm of said angle levEr carrying said roller means and the other arm of said angle lever having said spring loaded ejector pin resting thereagainst.
 3. An arrangement in combination according to claim 2, in which said third cam disc means is of a pot-shaped design opening toward said driving means, that portion of said third dam disc means which is in cooperative engagement with said third roller means surrounding a portion of the splined section of said splined shaft means.
 4. An arrangement in combination according to claim 2, which includes bolt means rotatably journalled in that arm of said pivotable angle lever which is adjacent to said ejector pin, said bolt means having a flattened side for engagement with said ejector pin and being rotatable about an axis substantially parallel to the pivot axis of said angle lever. 